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Vishay General Semiconductor - Diodes Division SMC5K33A-M3/H
- Part No.:
- SMC5K33A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K33A-M3/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,225
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Product details
Overview
SMC5K33A-M3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 93.8 A peak pulse current (IPPM), and 5000 W peak pulse power (10/1000 μs).
For engineers reviewing the SMC5K33A-M3/H datasheet, SMC5K33A-M3/H pinout, SMC5K33A-M3/H application, or SMC5K33A-M3/H equivalent, this device is selected for robust overvoltage protection in automotive power supplies, industrial sensor interfaces, and telecom DC input stages where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are not required - only SMC5K10A–SMC5K20A variants carry AEC-Q101.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds VBR. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs transients, while thermal resistance RthJA = 90 °C/W supports sustained operation up to TJ = 150 °C.
It meets IEC 61000-4-2 ESD immunity (30 kV contact/air), UL 497B recognition (E136766), and J-STD-020 MSL Level 1 reflow compatibility (260 °C peak). The SMC (DO-214AB) package uses matte tin-plated leads compliant with JESD 22-B102 and JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche onset range defining turn-on threshold |
| VC @ IPPM | 53.3 V at 93.8 A (10/1000 μs) - clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 5000 W (10/1000 μs) - peak transient energy absorption capability without failure |
| IR @ VWM | 1.0 μA max - leakage current at rated stand-off voltage, critical for low-power sensor line integrity |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive or industrial enclosures |
| Polarity | Unidirectional - protects against negative transients only; requires correct cathode orientation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case meeting UL 94 V-0; cathode indicated by color band; terminals are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to system ground or low-side reference | Provides return path for surge current; must be routed with low-inductance trace to minimize clamping overshoot |
| Cathode | Current exit terminal during reverse avalanche; connected to protected line | Color-banded end; connects to line requiring protection (e.g., 33 V rail); determines polarity of suppression |
Key Features
| Feature | Design Value |
|---|---|
| 5000 W peak pulse power (10/1000 μs) | Enables protection against severe load dump or inductive switching events in 12 V/24 V systems without derating |
| Clamping voltage ratio VC/VBR ≈ 1.38 | Indicates tight avalanche control and low dynamic impedance, reducing stress on downstream MOSFETs or ICs |
| 30 kV HBM ESD rating (IEC 61000-4-2) | Meets stringent electrostatic discharge immunity for exposed connectors in industrial field equipment |
| Halogen-free, RoHS-compliant (M3 suffix) | Supports environmental compliance for global OEM shipments without compromising surge performance |
| RthJM = 4.0 °C/W | Enables efficient heat transfer to PCB copper pour or heatsink, sustaining repeated surge duty cycles |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 33 V supply rail in body control modules from ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp absorbing >5000 W surges within nanoseconds to prevent MCU brownout or regulator latch-up. Use Value: Clamps to 53.3 V at 93.8 A, maintaining safe margin below 60 V absolute maximum ratings of common PMICs and gate drivers. | Use Scenario: Shielding analog output (4–20 mA) or CAN FD signal lines in factory automation sensors from cable-coupled lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response (sub-ns) voltage limiter placed directly at connector interface to shunt transient energy before reaching precision amplifier or transceiver. Use Value: Low 1.0 μA leakage preserves signal accuracy; 53.3 V clamping prevents damage to 36 V-rated RS-485 transceivers or op-amps. |
| Telecom DC Power Feed Protection | Consumer Appliance Motor Drive Surge Suppression |
Use Scenario: Safeguarding -48 V or +33 V DC feed inputs in remote radio units and base station power supplies against AC line coupling and lightning surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk DC input, coordinated with upstream fuses and secondary filtering. Use Value: 5000 W rating handles 8/20 μs surges up to 573 A; UL 497B recognition validates safety compliance for telecom infrastructure. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools) connected to 33 V logic-supplied motor controllers. IC Role / Device Role / Timing Role: Snubber-grade TVS across motor terminals or H-bridge outputs to limit inductive kickback voltage. Use Value: 33 V VWM matches typical motor driver supply rails; 150 °C TJ max supports operation near hot motor housings without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-M3/5A | Lower PPPM (600 W), SMB (DO-214AA) package, same VWM/VBR/VC specs | Reduced surge handling for space-constrained consumer electronics; not suitable for automotive load dump | Select when board area is limited and surge energy remains ≤600 W |
| SMC5K33CA-M3/H | Bi-directional variant; identical VWM/VBR/VC but symmetric clamping for AC or bidirectional signal lines | Required for protecting differential pairs, audio lines, or AC-coupled interfaces where both polarities need suppression | Choose only if bidirectional protection is needed; otherwise SMC5K33A-M3/H offers lower leakage and tighter unidirectional control |
Compared with SMBJ33A-M3/5A and SMC5K33CA-M3/H, the SMC5K33A-M3/H delivers 8.3× higher surge power handling than SMBJ33A while maintaining identical voltage thresholds, and provides lower leakage and sharper unidirectional clamping versus the bi-directional SMC5K33CA - making it optimal for high-reliability 33 V DC rail protection.
Availability
SMC5K33A-M3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC power feed applications requiring stable component supply, long-term lifecycle support, and consistent surge performance across production batches.
Supply support for SMC5K33A-M3/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS, MOSFETs, and optoelectronics with emphasis on reliability, ruggedness, and application-specific validation.
The SMC5KxxA series was engineered for high-energy transient suppression in harsh environments - targeting automotive subsystems, industrial controls, and telecom infrastructure where 5000 W surge immunity and UL/IEC compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMC5K33A-M3/H under a 10/1000 μs surge?
The SMC5K33A-M3/H has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 93.8 A using the standard 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet 87742 and defines the upper voltage limit imposed on the protected circuit during surge events.
Is the SMC5K33A-M3/H AEC-Q101 qualified?
No, the SMC5K33A-M3/H is not AEC-Q101 qualified. Per Vishay documentation, AEC-Q101 qualification applies only to SMC5K10A through SMC5K20A variants (with HM3 suffix). The SMC5K33A-M3/H is rated for industrial-grade operation across –55 °C to +150 °C but lacks automotive qualification.
What does the "M3/H" suffix indicate in SMC5K33A-M3/H?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance; "H" specifies packaging in 7-inch diameter plastic tape and reel with 850 units per reel. This ordering code aligns with Vishay's preferred packaging format for automated SMT assembly.
Can the SMC5K33A-M3/H be used in bidirectional signal protection?
No, the SMC5K33A-M3/H is unidirectional and only clamps negative transients relative to its cathode. For bidirectional protection (e.g., on AC lines or differential signals), the bi-directional variant SMC5K33CA-M3/H must be used instead - it shares the same package and voltage ratings but provides symmetrical clamping in both polarities.
What is the thermal resistance junction-to-ambient (RthJA) for the SMC5K33A-M3/H?
The SMC5K33A-M3/H has a typical thermal resistance junction-to-ambient (RthJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A test conditions. This value assumes a 2 oz. copper footprint and is critical for estimating temperature rise during repetitive surge events or elevated ambient operation.
SMC5K33A-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 93.8A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K33A-M3/H FAQ
1.How can I place an order for SMC5K33A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K33A-M3/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMC5K33A-M3/H reliable?
The price and inventory of SMC5K33A-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K33A-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K33A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K33A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K33A-M3/H?
SMC5K33A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K33A-M3/H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMC5K33A-M3/H?
For technical support, including SMC5K33A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K33A-M3/H requirements.
6.How does Aetrix verify that SMC5K33A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K33A-M3/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMC5K33A-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K33A-M3/H?
All SMC5K33A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K33A-M3/H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMC5K33A-M3/H part is unused and in its original packaging.
Return procedure for SMC5K33A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K33A-M3/H Tags
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